Hopper is a powerful interactive tool that allows users to transfer and manipulate files and directories by means of a graphical user interface. Users can connect to and manage resources using the major file transfer protocols. Implemented in Java, Hopper can be run almost anywhere: from an individual's desktop machine to large production machines. In a high-performance computing environment, managing files can become a difficult and time-consuming task that distracts from scientific work. Users must deal with multiple file transfer protocols, transferring enormous amounts of files between computer platforms, repeated authentication, organizing massive amounts of data, and other detailed but necessary tasks. This is often accomplished with a set of several different tools, each with its own interface and idiosyncrasies. Our goal is to develop tools for a more automated approach to file management that substantially improves users' ability to transfer, organize, search, and operate on collections of files. This paper describes the Hopper tool for advanced file management, including the software architecture, the functionality, and the user interface.
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